A neighbor of mine was cleaning out his basement and found a stock of old ammo 9mm, 5.56 NATO, 7.62 X 39 .38 special and various 12 gauge shell. The problem is most of these rounds were submerged in water. No idea how long. Most of the packaging was carboard and completely destroyed. Most of the 12 gauge cells are rusted and I am sure they are junk now. Some of the other ammo is corroded. Some looked decent. Not sure if this ammo is worth saving. What is the possibility of it firing? Any help would be appreciated, as I have only dealt with off the shelf ammo.